72636866 has 16 divisors (see below), whose sum is σ = 110716800. Its totient is φ = 35734608.

The previous prime is 72636857. The next prime is 72636887. The reversal of 72636866 is 66863627.

It is a super-2 number, since 2×72636866² = 10552228604603912, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59276 + ... + 60488.

It is an arithmetic number, because the mean of its divisors is an integer number (6919800).

Almost surely, 2^72636866 is an apocalyptic number.

72636866 is a deficient number, since it is larger than the sum of its proper divisors (38079934).

72636866 is a wasteful number, since it uses less digits than its factorization.

72636866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673.

The product of its digits is 435456, while the sum is 44.

The square root of 72636866 is about 8522.7264416969. The cubic root of 72636866 is about 417.2397718574.

The spelling of 72636866 in words is "seventy-two million, six hundred thirty-six thousand, eight hundred sixty-six".